I don't think you have to like cooking or be adventurous to really get worth out of it.
You can do some meat and 3 veg type meals, as well as some casserole type things - like the stroganoff - honestly this is so easy and full proof and takes 5 mins prep and 20 mins cooking. No need to like cooking, lol, just eating.
Also things like juices, custards, salads, sorbet.
Not sure if your boys eat much pasta but my girls do and although they are generally great with veg (though the 3 year old can be a bit hit and miss) I love the ease of adding some 'invisible' veg so easily to the sauces. (we did the creamy tomato and salami one last night and you wouldn't know there was also zucchini etc in there.) Types of veg they don't normally like can be easily incorporated.
I also love being able to make things like my own stock (I am in love with the vegie stock concentrate) so I know things don't have additives. I've only had my thermomix a week and I've used it loads (see
http://thermomixmeals.blogspot.com/ if you want to see what I've been using it for). And we've still had our weekend steaks etc.